Characteristics and Seasonal Variations in Mass and Multi-element Concentrations of Ambient Fine and Coarse Particles. A Case Study at Kofu City.:A Case Study at Kofu City
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The mass and multi-element concentrations were investigated for PM<SUB>2.5</SUB> (<2.5μm) and PM<SUB>10</SUB> (<10μm), which were collected on regenerated cellulose filters at Kofu City from July 1997 to August 1998 every 10-20 d by a low-valume sampler by turns every 5 min. Samples collected were subjected to X-ray fluorescence analysis using thin-layer standard samples with activated carbon, and seventeen elements were determined. The PM<SUB>2.5</SUB> mass percentage of PM<SUB>10</SUB> ranged between 61% and 90%(75% in av.), and the annual average concentration was 27μg m<SUP>-3</SUP>, which exceeded the new standard for PM<SUB>2.5</SUB> promulgated by U.S. EPA in 1997.<BR>Almost all parts of S, Cl, Zn. Br and Pb and most of V, Cu and K were concentrated in fine particles over a year, and presumed to arise from anthropogenic sources such as combustion of refuse. Both atmospheric concentrations and enrichment factors to crust of these elements except S and V showed high values in late autumn to early winter. The high concentrations of S and V in fine particles were observed in summer and presumed to arise from related anthropogenic sources.<BR>Most of Mg, Al, Si, Ca, Ti and Fe were contained in coarse particles and presumed to arise mainly from soil over a year. A contribution from road dust or cement was also presumed for Ca. In April, these elements in coarse particles showed high contributions and were presumed to be transported mainly from China as Kosa aerosol. For Na, Cr and Mn, similar amounts were contained in both coarse and fine particles.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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